Dental disk-holder.



No. 636,571. Patented Nuv. 7, I899.

G., SIBLEY.

DENTAL DISK HOLDER. (A pplicntionfiled Apr. 27, 1599.) (lo Nodal.)

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" UNITE STATES PATENT OFFICE.

' GIDEON SIBLEY, OF PHILADELPHIA, PENNSYLVANIA.

DENTAL DISK-HOLDER.

SPECIFIGATIGN forming part of Letters Patent No. 636,571, dated November7, 1899. Application filed April 27, 1899. Serial No. 714,725. (Nomodel.)

To all whom it may concern:

Be it known that I, GIDEoN SIBLEY, a citizen of the United States,residing in the city and county of Philadelphia, in the State ofPennsylvania, have invented certain new and useful Improvements inDental Disk Holders, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification.

The object of this invention is to provide a simple and efficientconstruction of disk holder or mandrel for dental engines, and, asgenerally stated, it comprises an arbor, a threaded sleeve thereon, anda clamping-head fitted to said sleeve and having a sliding connectionwith the arbor, whereby a grinding or polishing disk may besecurely yetdetachably clamped between said head and sleeve, as will be hereinafterfully described and claimed.

In the annexed drawings, Figure 1 is a side elevation of the invention,showing a disk clamped thereby. Fig. 2 is a plan of the same. Fig. 3 isa longitudinal vertical section thereof, enlarged. Fig. 4 is a similarView of the several parts as detached. Fig. 5 is a transverse section onthe line 5 5 of Fig. 3. Fig. 6 is a view of a slight modification belowdescribed.

A represents the mandrel, which is adapted to be connected with anddriven by the rotatable spindle in the usual handpiece of a dentalengine. This mandrel embodies in its construction an arbor a, a sleeve17, and a clamping-head c. The arbor is provided in its outer end withan axial recess or socket a, which is preferably, though notessentially, square in cross-section. The sleeve 1) is rotatably fittedupon this end of the arbor and is provided with aninternally-serew-threade'd por-' tion b, which projects beyond thelatter. In the present instance the sleeve is provided with an internalshoulder 6 upon which bears a flange a on the upper end of the arbor,and in conjunction with a collar (1, fast on the arbor, serves tomaintain the sleeve in place.

' The outer extremity of the sleeve is preferably flanged or expanded,as at 11 to afford ample bearingsurface for the disk. The clamping-head0 comprises a cap 0', provided with a threaded portion 0 which isadapted to be screwed into the threaded portion of the sleeve, andprovided also with a centrally-depending stem 0 adapted to register withthe recess or socket in the arbor. The cross=section of the stemcorresponds with that of the recess or socket, so as to prevent rotationof the clamping-head independently of the arbor, yet permit freelongitudinal movement of said head. Hence by properly turning the sleevein respect to the arbor the head may be ver tically adjusted, so as toscrew the cap down upon or retract it from the opposing end of thesleeve. Thus it will be seen that an ordinary perforated grinding orpolishing disk, as (1, may be applied to the under side of the head andthe latter then be screwed hard upon the sleeve in a manner to clamp thedisk securely in place; also, that by simply reversing the operation theclamping-head and disk may be detached from the sleeve of the mandrel.

In Fig. 6 I have shown a slight modification wherein the flanged end ofthe sleeve is provided with small spurs b, which are adapted topenetrate the disk, the cap of the clamping-head being cup-shaped orsocketed to re ceive the spurs.

I claim as my invention- 1. A dental disk-holder,-comprising an arbor, arotatable sleeve thereon provided with a projecting threaded portion,means to prevent longitudinal movement of said sleeve, and aclamping-head provided with a threaded portion adapted to the threadedportion of the sleeve, the said threaded portion of the head and theopposing extremity of the arbor being provided one with a socketv andthe other with a stem which is fitted to said socket, the said socketand stem beingof such crosssectional form as to afford a slidingconnection between said head and arbor yet prevent independent rotationthereof in respect to each other.

2. A dental disk-holder, comprising an arbor flanged at one end thereofand provided with a longitudinal recess or socket and with a flange, andan internally-shouldered sleeve on said arbor coacting with said flangeprovided with a projecting internally-threaded portion, in combinationwith a clamping-head In testimony whereof I have hereunto affixed mysignature in the presence of two sub- IO scribing witnesses.

GIDEON SIBLEY.

W'itnesses:

JOHN R. NOLAN, HARRY O. DINMoRE.

